A body of mass $m=3.513 \mathrm{kg}$ is moving along the X-axis with a speed of $5.00{ \mathrm{ms}}^{-1}$. The magnitude of its momentum is recorded as

Momentum, $p=mv=3.513\times 5.00$

$=17.565 \mathrm{kg}-{\mathrm{ms}}^{-1}$

As the number of significant digits in m is 4 and v is 3, so p must have 3 (minimum) significant digits. Hence,

$p=17.6 \mathrm{kg}-{\mathrm{ms}}^{-1}$